My I watch face went grey color only

Choose how text and other items appear

You can make text bold, use grayscale, and set other options to change the appearance of items on the screen. Open the Settings app  on your Apple Watch, tap Accessibility, then turn the following options on or off:

• Bold text
• Labels
• Turn on button labels to see an additional position indicator. With labels on, you see a one (1) on any option that is on, and a zero (0) on options that are turned off.
• Grayscale
• Reduce transparency
• Reducing transparency increases legibility with some backgrounds.

You can also open the Apple Watch app on your iPhone, tap My Watch, tap Accessibility, then change an option.

Note: Restart your Apple Watch for changes in bold text and grayscale to take effect.

go to watch app on your iphone

accessibility -> turn off Grayscale